I have an 8 inch hollow handle carving fork with steel/iron tines. The handle has only one mark on it -- "I.R" with the dot centered (not near the bottom). This mark appears to be of John Roberts, but everything I have seen of him adds the "& Co" mark after the "I.R". Also, there are no hallmarks or any other marks at all on the piece.
I know that John Roberts was Sheffield, but I see no hallmarks, so I tried the coin silver section first. I apologize if this is not the right place, but as I said, I'm just not sure what this is.
Any help in identifying this would be greatly appreciated.
Thank you.